Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 49, NWS Las Vegas, NV

July 9, 2011Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 9, 2011, 4:46 PM MST for Mohave County, Arizona. It was in force for 119 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2011, 4:46 PM MST (23:46 UTC)
Expired: Jul 9, 2011, 6:45 PM MST
In force: 119 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 58 km from the middle of the area, began a volume at 23:46 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 11.8 hours before the alert went out and 108 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 210 J/kg
Mixed-layer CIN: -269 J/kg
Mixed-layer LCL: 2037 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: -4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

915 
WGUS55 KVEF 092346
FFWVEF
AZC015-100145-
/O.NEW.KVEF.FF.W.0049.110709T2346Z-110710T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
446 PM MST SAT JUL 9 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...

* UNTIL 645 PM MST.

* AT 441 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM 6 MILES SOUTHWEST OF TEMPLE BAR
  CAMPGROUND...OR 24 MILES EAST OF BOULDER CITY. THE STORM PRODUCING
  FLASH FLOODING WAS NEARLY STATIONARY.

* LOCATIONS IMPACTED INCLUDE...TEMPLE BAR AND TEMPLE BAR CAMPGROUND
  AND THE ROAD FROM HIGHWAY 93 TO TEMPLE BAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.

&&

LAT...LON 3612 11452 3612 11446 3613 11440 3609 11432
      3605 11432 3603 11428 3588 11429 3587 11455

$$

JH

2 follow-up statements

717 
WGUS75 KVEF 100044
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
544 PM MST SAT JUL 9 2011

AZC015-100145-
/O.CON.KVEF.FF.W.0049.000000T0000Z-110710T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
544 PM MST SAT JUL 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MST FOR WEST
CENTRAL MOHAVE COUNTY...

AT 538 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING.  THESE STORM WERE 
LOCATED NEAR TEMPLE BAR CAMPGROUND...OR 28 MILES EAST OF BOULDER 
CITY. THE THUNDERSTORMS WITH EXCESSIVE RAIN WERE NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...TEMPLE BAR AND TEMPLE BAR CAMPGROUND 
AND THE ROAD FROM HIGHWAY 93 TO TEMPLE BAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.

&&

LAT...LON 3612 11452 3612 11446 3613 11440 3609 11432
      3605 11432 3603 11428 3588 11429 3587 11455

$$

JH

402 
WGUS75 KVEF 100145
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
645 PM MST SAT JUL 9 2011

AZC015-100155-
/O.EXP.KVEF.FF.W.0049.000000T0000Z-110710T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
645 PM MST SAT JUL 9 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR WEST CENTRAL MOHAVE
COUNTY...

RAIN HAS NOT FALLEN IN THE WARNING AREA FOR QUITE SOME TIME. NO 
REPORTS OF FLOODING WERE RECEIVED.

LAT...LON 3612 11452 3612 11446 3613 11440 3609 11432
      3605 11432 3603 11428 3588 11429 3587 11455

$$

JH

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 9, 1:28 PM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 9, 3:01 PM MST	Severe Thunderstorm Warning	VEF	Mohave	44 min
Jul 9, 4:07 PM MST	Flash Flood Warning	VEF	Mohave	113 min
Jul 9, 4:57 PM MST	Flash Flood Warning	VEF	Mohave	98 min

Nearby

Flash Flood Warnings in Arizona, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.